[PATCH v1 08/10] vhost: implement vhost_dev_start method

[Cindy Lu <lulu@redhat.com>]

use the vhost_dev_start callback to send the status to backend

Signed-off-by: Cindy Lu <lulu@redhat.com>
---
 hw/virtio/vhost.c         | 17 +++++++++++++++++
 include/hw/virtio/vhost.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 01ebe12f28..bfd7f9ce1f 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -744,6 +744,7 @@ static void vhost_iommu_region_del(MemoryListener *listener,
     }
 }
 
+
 static int vhost_virtqueue_set_addr(struct vhost_dev *dev,
                                     struct vhost_virtqueue *vq,
                                     unsigned idx, bool enable_log)
@@ -1661,6 +1662,11 @@ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
         }
     }
 
+    r = vhost_set_start(hdev, true);
+    if (r) {
+        goto fail_log;
+    }
+
     if (vhost_dev_has_iommu(hdev)) {
         hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true);
 
@@ -1697,6 +1703,8 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
     /* should only be called after backend is connected */
     assert(hdev->vhost_ops);
 
+    vhost_set_start(hdev, false);
+
     for (i = 0; i < hdev->nvqs; ++i) {
         vhost_virtqueue_stop(hdev,
                              vdev,
@@ -1722,3 +1730,12 @@ int vhost_net_set_backend(struct vhost_dev *hdev,
 
     return -1;
 }
+
+int vhost_set_start(struct vhost_dev *hdev, bool started)
+{
+
+    if (hdev->vhost_ops->vhost_dev_start) {
+        hdev->vhost_ops->vhost_dev_start(hdev, started);
+    }
+    return 0;
+}
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 085450c6f8..59ea53f8c2 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -92,6 +92,7 @@ struct vhost_dev {
     const VhostDevConfigOps *config_ops;
 };
 
+
 int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
                    VhostBackendType backend_type,
                    uint32_t busyloop_timeout);
@@ -137,4 +138,5 @@ int vhost_dev_set_inflight(struct vhost_dev *dev,
                            struct vhost_inflight *inflight);
 int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size,
                            struct vhost_inflight *inflight);
+int vhost_set_start(struct vhost_dev *dev, bool started);
 #endif
-- 
2.21.1